U.S. Treasury securities are debt instruments issued by the U.S. Department of the Treasury to finance government spending. Backed by the 'full faith and credit' of the U.S. government, they are considered the world's benchmark risk-free asset.
Types by Maturity
Market Size & Importance
Total outstanding U.S. Treasury debt exceeds $35 trillion (2025, Treasury Department). The 10-year Treasury yield is the most important benchmark in global finance β it directly influences mortgage rates, corporate bond pricing, and equity valuations through the discounted cash flow model.
Primary Market
The Treasury sells bonds through regular auctions. Primary dealers (24 major financial institutions) are required to bid at every auction. Auction results (bid-to-cover ratio, tail, indirect bidder percentage) are closely watched as demand indicators.
Historical Context
The 10-year yield reached 15.84% in September 1981 (peak of the Volcker era) and hit a record low of 0.52% in August 2020 (COVID flight to safety). The journey from sub-1% to over 5% in just 3 years (2020-2023) was one of the most dramatic moves in Treasury market history.